Multiscale modeling of hysteretic phenomena in magnets „(invited)

Authors

Vladimir P. Antropov, Ames Laboratory, US Department of EnergyFollow
Kirill D. Belashchenko, University of Nebraska-LincolnFollow

Date of this Version

5-15-2003

Comments

Published in JOURNAL OF APPLIED PHYSICS VOLUME 93, NUMBER 10. © 2003 American Institute of Physics. Used by permission.

Abstract

Methodology of multiscale modeling of hysteretic phenomena in magnets is discussed. A practical combination of first-principles, micromagnetic, and microstructural calculations is constructed which allows one to study the hysteretic phenomena in hard magnets. Advantages and shortcomings of this approach are discussed. Multiscale nature of coercivity in CoPt type magnets is elucidated. Two sources of coercivity in polytwinned CoPt type magnets developing at different length scales, domain wall pinning at antiphase boundaries and splitting at twin boundaries, are illustrated for a realistic microstructure